Links
Java-Links:
http://www.oracle.com/technetwork/java/
http://www.java.net
http://spring.io
http://www.hibernate.org
http://www.apache.org
http://www.netbeans.org
http://www.jetbrains.com
http://www.eclipse.org
http://openjdk.java.net
Scala-Links:
http://lightbend.com
http://www.scala-lang.org
Software Engineering
Everyday stuff - german news sites
http://www.heise.de
http://www.golem.de
CSS-Styles:
http://www.css4you.de
http://www.w3schools.com
http://www.caniuse.com